Magnetic Texturing of High-Tc Superconductors

Porcar, Laureline; Rango, Patricia de; Bourgault, D.; Tournier, R.

doi:10.5772/48698

Cited by 3 publications

(3 citation statements)

References 54 publications

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“…The critical radius R * ls in Equation (3) and the critical thermally activated energy barrier ∆G * ls k B T in Equation ( 4) are calculated assuming dε ls /dR = 0:…”

Section: The Homogeneous Nucleationmentioning

confidence: 99%

“…The liquid properties are often neglected because the classical nucleation equation predicts the absence of growth nuclei and nucleation phenomenon above the melting temperature. The presence of growth nuclei above T m being known [ 1 , 2 , 3 ], an additional enthalpy is added to this equation to explain these observations. A new model of nucleation is built from the works of Turnbull’s [ 4 ] characterized by two types of homogeneous nucleation temperatures below and above T m .…”

Section: Introductionmentioning

confidence: 99%

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Building and Breaking Bonds by Homogenous Nucleation in Glass-Forming Melts Leading to Transitions in Three Liquid States

Tournier

Ojovan

2021

Materials

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The thermal history of melts leads to three liquid states above the melting temperatures Tm containing clusters—bound colloids with two opposite values of enthalpy +Δεlg × ΔHm and −Δεlg × ΔHm and zero. All colloid bonds disconnect at Tn+ > Tm and give rise in congruent materials, through a first-order transition at TLL = Tn+, forming a homogeneous liquid, containing tiny superatoms, built by short-range order. In non-congruent materials, (Tn+) and (TLL) are separated, Tn+ being the temperature of a second order and TLL the temperature of a first-order phase transition. (Tn+) and (TLL) are predicted from the knowledge of solidus and liquidus temperatures using non-classical homogenous nucleation. The first-order transition at TLL gives rise by cooling to a new liquid state containing colloids. Each colloid is a superatom, melted by homogeneous disintegration of nuclei instead of surface melting, and with a Gibbs free energy equal to that of a liquid droplet containing the same magic atom number. Internal and external bond number of colloids increases at Tn+ or from Tn+ to Tg. These liquid enthalpies reveal the natural presence of colloid–colloid bonding and antibonding in glass-forming melts. The Mpemba effect and its inverse exist in all melts and is due to the presence of these three liquid states.

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“…The critical radius R * ls in Equation (3) and the critical thermally activated energy barrier ∆G * ls k B T in Equation ( 4) are calculated assuming dε ls /dR = 0:…”

Section: The Homogeneous Nucleationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Building and Breaking Bonds by Homogenous Nucleation in Glass-Forming Melts Leading to Transitions in Three Liquid States

Tournier

Ojovan

2021

Materials

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“…Since the discovery of superconductivity in 1904, or about 110 years ago, researches all over the world have endeavored to apply superconductivity in every aspect oflife [1]. However, superconductivity has interesting parameter which occurs at extremely low temperature condition.…”

Section: Introductionmentioning

confidence: 99%

Manufacture of Bi, Pb-Sr-Ca-Cu-O pellet disc using wet method

Hendrik¹,

Sebleku²,

Yudanto³

et al. 2016

AIP Conference Proceedings

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Abstract.A confirmation of favorable properties of pellet disc of HTSBPSCCO is required in order to optimally do subsequent process of powder-in-tube (PIT) fabricated intosuperconductor wires. Wet method is a simple method in fabricating superconductor wire when it comes to mass production. In order to optimize this method, temperature parameter holds a decisive role in the formation of the 2223 phase of BPSCCO. We have synthesized two samples using wet method with the sintering temperature of 855 0 C and 865 0 C for 90 hours in air atmosphere.XRD analysis points out the formation of Bi-2223 phase of the sample with the sintering temperature of 855°C, whereas Bi-2212 phase is detected in the one with the sintering temperature of 865 0 C. The surface morphology of both samples are layers-like. According to temperature dependence of resistivity measurement results, both samples have superconductivity behavior below critical temperature (Tc). The former one (T sintering = 855 0 C ) has conductive-like behavior above Tcof whichits resistivity starts to drop at 112K and reaches zero resistivity at 78K, and the latter one (T sintering = 865 0 C )has semiconductor-like behavior of whichits resistivity starts to drop at 82K and then reaches zero resistivity at 48K.

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Validation of non-classical homogeneous nucleation model for G-glass and L-glass formations in liquid elements with recent molecular dynamics simulations

Tournier

2021

Scripta Materialia

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Magnetic Texturing of High-Tc Superconductors

Cited by 3 publications

References 54 publications

Building and Breaking Bonds by Homogenous Nucleation in Glass-Forming Melts Leading to Transitions in Three Liquid States

Building and Breaking Bonds by Homogenous Nucleation in Glass-Forming Melts Leading to Transitions in Three Liquid States

Manufacture of Bi, Pb-Sr-Ca-Cu-O pellet disc using wet method

Validation of non-classical homogeneous nucleation model for G-glass and L-glass formations in liquid elements with recent molecular dynamics simulations

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